Glass-molding machine.



PATENTED SEPT. 22, 1903.

APPLIUATION FILED MAY 7 1992.

2 SHEETS-SHEET 1A HD .KODEL PATENTBD SERT. 22, 1.903.

F. H. GIBSON. GLASS MOLDING MACHINE; APPLICATION FILED MAY '7, 1902; N0 MGDEL. Z SHEETS-SHEET 2" No. vedete.

.n UNITED STATES atented September 22, 1903.

FRANK H. GIBSON ,OF BRIDGrE'lON,NEWT JERSEY.

GLASSeMOlfDlNG ,MACHlNEf SPECIFICATION forming part of Letters Patent No. 739,666, dated September 22, 1903. Application filed May 7, 1902. Serial No. 106 ,802. (No model.)

xo ously for the purpose of making what are known as glass insulators, such articles having a screw-threaded cavity whereby they may be secured in place.

My invention comprises certain novel fea- I 5 tures in presses of this character, all of which are clearly shown in the accompanying drawings, in which- Y Figure 1 is a side elevation, partly in section, of a press made in accordance with my zo invention. Fig. 2 is a plan view of the same.

Fig. 3 is a sectional view illustrating a detail of my invention. Fig. 4 is a plan view of `a structure illustrating a modification of my invention; and Fig. 5 is asectional elevationV 25 of a portion of the structure shown in Fig. 4.

The structure forming the subject of my v invention is portable, being mounted upon a. suitable wheeled truck, whereby it canbe moved to any convenient place in the mold-J 3o ing-shop. This portable carriage is provided with a suitable standard which carries the operating mechanism, and near the base of this standard a rotatable table is provided which carries a series of molds.

In the accompanying drawings,1 represents the carriage or truck supporting the mechanism employed in operating the molds 2.

3 is a standard mounted upon said truck, preferably at the center of the same.

. 4 represents the base portion of the standard, and 5 the rotatable table mounted upon said base and having an interposed ball-bearing 6, said table serving to support the molds 2,within which the glass insulators are formed,

and also the annular frame 7, carrying the screw-plungers 8, whereby the threaded interior of the `insulator is formed. These screW-plungers are provided with handles 9. The annular frame 7 is supported by means 5o of brackets 10, secured at their opposite ends to the inside of the same, said brackets having projecting feet, which are bolted to the table 5. Y

CarriedY by the standard 3 and secured thereto by means of set-screws 11 is a sleeve 12, which supports a plunger 13 and the mechanism for operating the same. The plunger 13 is guided in a boss 14, carried by an arm 15, projecting from the sleeve l2, and pivoted to this boss 14 at 16 is a lever 17.

Pivotally mounted at 1S on the arm 15 of the sleeve l2 is a link 19, which is connected to the lever 17 by means of a link 20. The plungerl carries an adjustable collar 21 near the upper end of the same, and to bring this plunger into operative connection with the lever or handle 17 a connecting-rod 22 is employed, which is pivoted to said collar at 23 and to the link 19 at 24. By pulling down on the lever 17 the plunger 13 will de depressed, and when said plunger is directly over one of the screw-plungers 8 and the latter is in line with the central opening of the mold said screw-plunger will be forced into the molten glass contained within said mold.

l The molds 2 are similar in all essential re-y spects to molds heretofore used in the manufacture of articles of this class. In the presentinstance they are provided with tops or follower-plates 25, having handles 26, Whereby said plates or followers may be readily laid on said molds or removed therefrom.

In order that the stops or follower-plates oi' the molds may be maintained in a xed position during this forcing of the screw-plunger into the molten glass contained therein, I provide the vsteadying-rods 27. These rods are carried by an adjustable collar 28, mounted on the plunger 18, passing through bosses 29 on the same. Atthe lower end these rods are guided by passing through bosses 30,-carried by a collar 3l, secured to the. lower end of the plunger 13.

. Interposed between the bosses 29 of the upper collar 28 and adjustable collars'82, car- 9 ried by the rods 27, are the springs 33. l/Vhen the plunger 13 is depressed, as before indicated, the rods 27 will be carried down into contact with the tops or followerplates of the molds and will be stopped thereby, the

further movementofthe plunger 13 compressing the springs 33 and imparting the necessary holding effect of the rods 27.

As noted,the screw-plungers may be readily pushed into the molten glass contained within the mold by the pressure exerted by the plunger 13; but in order that the thread which is formed by the introduction of such screwplungers into the glass may be preserved it is necessary that they be screwed out, and I accomplish this result in the following manner:

The annular ring 7, supporting the screwplungers 8, is provided with a series of detachable members 35, which carry the screwplu ngers 8, which members have openings 36, through which said plungers are adapted to pass. These openings 36 are smooth, so that unless holding means be provided the screwplungers may freely slide up and down through the same. In order, however, to hold these screw-plungers in place and to provide means whereby they may be raised out of the mold by the simple turning of the same and, further, to insure that said plungers may be readily depressed and forced into the glass, I provide each member 35 with a spring-controlled pin 37, (clearly shownin Fig. 3,) which pin engages the threads of said screw-plu nger. This pin is arranged in a boss 38 at the side of the members 35 and is held in place by means of the screw-cap'39, through the cen ter of which said pin projects. Interposed between said screw-cap and the head of the pin is a spring 40. It will be readily understood, therefore, that while the spring-controlled pin is suiicient to support the screwplunger and will also engage the thread of the same and act as a nut'when it is desired to raise the screw-plunger by turning the same it will not prevent the ready depression of said screw-plungers when acted upon by the plunger 13. The screw-plungers have threads interrupted at the point 41, which portion is adjacent to the aperturein the follower-platel when the screw-plungers are forced into place in the molds. A

In order to center the molds and screwplungers carried by the table beneath the plunger 13, the table is provided with notches or nicks 42 on the under side in line with the centers of the molds and screw-plungers, and

adapted to engage these notches or nicks is a spring-controlled holding-pawl 45. The table is readily rotatable by hand, and after the molds have been filled with glass they are then brought beneath the plunger 13, by which the screw-plungers will be forced into the glass. After this the table will be given a partial rotation to bring the next screwplunger and mold beneath theplunger 13, and so on throughout the operation ofthe machine. When the glass in the mold has sufficiently cooled, each screw-plunger 8 may be rotated by means of its handles and will be thereby lifted from the mold. After this has been done the molds may be emptied and fresh molds put in their place. v

In practice it often occurs in machines of this character that the heating of the screwplungers takes place very rapidly and it becomes impossible to operate the same by hand. In order to prevent as much as possible this heating of the handles 9 and keep the plungers sufficiently cool to prevent the glass sticking' to the same, I may provide a modified structure, such as illustrated in Figs. 4 and 5, in which 50 represents a wheel-like structure carried by the standard2 and having a series of screw-plunger carriers 35a mounted on the rim 5l. These plunger-carrying members are provided with threaded bolts 52 and washers 53, which secure the rollers 54 in place above and below the rim 5l. The wheel is fixed to the standard 3fL preferably by a spline or key 55, and allot' the plu nger-carrying members 35a are movable around the rim. Hence a greater number of plungers can be used, as they can be kept suhciently cool to screw out of the glass readily. These plungercarrying members 35a are set equidistant throughout the rim and are spaced apart by the adjusting-nuts 56. As shown in the accompanying drawings, these members'35a are readily detachable by simply removing one set of rollers and their securing means. I may provide, however, a hinged-rim segment, whereby the screw-plunger carrying members may be readily placed upon or removed from the rim 5l. In each instance these screwplunger carriers carry the spring-controlled pins 37 to engage the threads of the plunger.

Having thus described my invention, I claim and desire to secure by Letters Patent- 1. In a glass-molding machine, the combination of the table, a mold carried thereby, an independent screwplunger, a guidingholder lfor the same, a yielding member carried by the holder and engaging said screwplunger, a pressure-plunger, a support for the same, and means for depressing the latter plunger wherebyit may engage the screwplunger, substantially as described. p

2. The combination in aglass-molding machine, of a table, a series of molds carried thereby, a series of independent screw-plungers arranged to be forced into the glass charged in said molds, guiding-holders for said screw-plungers,yielding members mounted in saidl holders and-engaging said screwplungers, said members permitting the depression of the plungers in a vertical line, a pressure plunger arranged to engage the screw-plungers, a support for said pressureplunger, and means for actuating the latter, substantially as described.

3. The combination in a glass-molding machine, of the rotatable table, a series of molds IOO IIC

plunger, substantially as described.

4. In a machine for molding internallythreaded glass insulators, a rotary table having a series of molds seated thereon, a plunger and a threaded spindle with Vnnscrewing.

means situated over each mold with means to yieldingly support them, combined with asingle depressingl mechanism having a fixed position vunder which the molds with the threaded spindles and attachments as de-v scribed are successively brought and whereby, in its actuation one of the threaded spindles is plunged into the mold directly below the same. A'

Y 5. In a machine for molding internallythreaded glass insulators, a rotary table having a seriesof molds seated thereon, followerplates for said molds, a plunger and a threaded spindle with unscrewing means situated over each mold, with means to yieldingly support them, combined with a single depressing mechanism having a fixed position,l under which the molds with the threaded spindles and attachments as described are successively brought and whereby, in its actuation, a mold covered by its follower-plate has a threaded spindle plunged therein.

In testimony whereof I have signed my FRANK Il. GIBSON.

lVitnesses:

N. B. OGDE'N, NEWTON ELMER. 

